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1mol --------6,02*10²³
x--------------3,612*10²³
x = 3,612*10²³*1mol/6,02*10²³ = 0,6mola
n₀ = nzd + nzd = 4mole + 0,6mola= 4,6mola
c₀ = 4,6mola/2dm³ = 2,3mol/dm³
czd = 0,6mola/2dm³ = 0,3mol/dm³
α = czd*100%/c₀ =0,3mol/dm³*100%/2,3mol/dm³ = 13%
K = (czd)²/cnz
Cnz = 4mole/2dm³ = 2mol/dm³
K = (0,3)²/2 = 0,045 = 4,5*10⁻²
Odp. B